While it is technically possible for you to erase the message body or for monks of a certain level to submit a suggestion that the post be deleted, both actions are frowned upon as they would prevent anyone who may have a similar problem in the future from finding this post and learning from it without repeating the question. (For this reason, if a monk of sufficient level were to consider the post for deletion, I can assure you that the request would be summarily ignored.)

As for closing/locking the post, some forums are fanatical about that sort of thing. This monastery is not. If someone else were to come by tomorrow, or next week, or even next year with a better solution, then why should they be prevented from suggesting it? Once again, even if you are no longer concerned with improving on the solution, others may see it and learn from it.